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Australia's premier 100 Mile Run - the KosciMiler takes you through the heart of the Snowy Mountains for the ultimate runner's high.

Race Category


Running Stones


Finals Access


164.6 KM

Elevation Gain

4738 M+

Start Date

Friday 8th December 2023

Race Start

Friday Flat, Thredbo - 05:30

Max Allowed Race Time

36 Hours



Running 100 Miles is an undertaking like no other, and the KosciMiler provides the ultimate opportunity to test your mind, body and soul. Set amongst Australia’s alpine playground in the Snowy Mountains, the KosciMiler journeys through alpine meadows, snow gum forests and pastural lands, over crystal clear creeks and sparkling lakes, past granite outcrops and ski villages, and to the highest point in Australia – the summit of Mt Kosciuszko. Runnable, scenic and supported – the KosciMiler is the 100 Mile run to do in Australia.


KosciMiler FRIDAY 8 DECEMBER 2023
ELIGIBILITY CRITERIA Completing a KosciMiler is a physically and mentally challenging event and participation in it requires significant training and preparation. For your health and safety, we require evidence of your ability to take part by meeting the eligibility criteria.
ENTRY INCLUSIONS Race entry, athlete t-shirt, finisher medal, Miler finisher gift, fully stocked checkpoints, drop bag service, on-course medical support and assistance, course photography (able to purchase during rego).
TRANSPORT Shuttle services will be available to the start line. Full details here.
MANDATORY GEAR All runners must carry mandatory gear during the race. Details are on the Mandatory Gear page.
MINIMUM AGE 18 years of age on race day
FIRST FINISHER 14hr 08min (7:38pm)
FINAL FINISHER 36 hours (5:30pm, Saturday)
TIMING RESULTS The following age divisions for both male and female will be used for race results (age on race day will be used to determine your age division): U20, 20-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70-74, 75-79, 80-84, 85+
AWARDS & PRIZES 1st place overall male and female in KosciMiler - $1000 (AUD)
10 fastest male and females receive a trophy
5 fastest male and females receive free entry to the following year’s event.
Trophies will be awarded to 1st in each division
UTMB World Series ws100KM
The KosciMiler is a UTMB Worlds Series 100M Event. Finishers of Kosci MILER will receive 4 running stones.


From alpine meadows to snow gum forests, golden pastures to lakeside trails, crystal clear creeks and the ultimate mountain summit – the KosciMiler course was designed as the ultimate Ultra-Trail experience.

Starting out in Thredbo, courses will ascend the mountainside before making the journey across the alpine plateau towards the highest peak in Australia – Mt Kosciuszko. After taking in the views from the top, runners will make their way down the trails of Perisher Valley, stopping off at iconic alpine locations like Charlotte Pass, Guthega and Sponars Chalet along the way to meet with their support crews.

The alpine meadows turn into snow gum forests, and trails twist and turn between trees as they make their way down towards Lake Jindabyne, before heading back for the mountains and making your way up the Thredbo Valley Trail to your final destination – the finish line at Thredbo.

With just under 5000m of climbing it’s not a mountainous Miler by any means, perfect for those looking to give the distance a go for the first time.


*Maps subject to change, and may change for reasons outside of the Race Organisers control. Select the Time Charts tabs to view the cut-off times for leaving the relevant checkpoint. Time Charts show estimated fastest and slowest times for each race leg and should be used a a guide only. Where the slowest times are greater than the cut-off time, the cut-off time will supersede the slowest expected estimates. If you miss the cut-off then you must follow the directions of officials. Please note that in bad weather conditions, cut-offs may need to be brought forward during the event.

Open KosciMiler course in Capra


All the information you need to know before starting an extraordinary adventure.


The KosciMiler has 13 checkpoints along its route, with differing levels of service, support crew access and supplies. The KosciMiler checkpoints offer you the opportunity to refuel, rehydrate, see your support crew and prepare for the next leg of your journey!
Read more about checkpoints


A drop bag service will be available which allows you to have your own personal supplies (gels, food, change of socks, shoes, shorts, lubricant, etc.) available at certain check points or at the finish. Please see the time charts above for information on which checkpoints have drop bags.
Read the rules on drop bags


Every runner at Kosci will have to carry mandatory gear. The mandatory gear list contains what we believe is the absolute minimum to keep you safe during the event and in the Snowy Mountain’s unpredictable weather systems. For KosciMiler runners, your gear will need to be checked pre-race.
Read Mandatory Gear rules


The KosciMiler course is publically accessible throughout the year, offering the opportunity to train on course prior to race day. However note that many sections are covered in snow in the colder months.

Please take care and give way to members of the general public when training on course.
Read about Training & Nutrition


We love support crews almost as much as our runners at Ultra-Trail Kosciuszko by UTMB – you are always the most colourful (and loudest!) and a huge part of the magical atmosphere of the whole weekend.

You also have the very important job of getting your runners to the finish line.

First job for support crew is to read the support crew section in the Runner Guide, available one month before the event. It contains important information you will need to know for the event.

To keep the event manageable as well as fair and safe for all athletes, and to make sure support crews do not get lost, there is some information that support crews need to know.

  • Support crews are allowed to assist runners at all checkpoints except at the Trout Hatchery (CP9 + CP11)
  • Support crews can access Eagles Nest Checkpoint via the Kosciuszko Express Chairlift. You can book lift passes here.
  • Support crews may only assist their runners within 200m either side of the checkpoints. Support Crews cannot run alongside their runners at any point on the course outside of the aid stations.

For more helpful information please visit the Transport Services page and Spectators page.



Pacers are companion runners that can accompany a KosciMiler athlete from various points. You can view pacer pickup locations in the table above. Pacers run for free but must be registered online no later than 7 December 2023. A link to register can be found on the athlete's registration confirmation email. The Pacer's role is to accompany their athlete, to provide moral support, pacing advice and companionship in the latter stages of the event.

There are strict rules regarding pacing:

  • Pacers MUST register themselves online as they will be required to sign a waiver.
  • All Pacers must wear a compulsory race bib number. Pacer(s) must attend Runner Check-in to collect their bib.
  • The minimum age for Pacers is 18 years old.
  • Pacer numbers will be light green and match the number of your athlete. This is so we know you are part of the event.
  • Pacers must carry their own set of mandatory clothing and equipment items to match that required by the KosciMiler runners.
  • Pacers cannot meet their runner before or after the designated start locations or at intermediate points. Doing so results in disqualification.
  • Competitors can use three Pacers – but only one at a time (they must change over at a checkpoint).
  • If you plan to make an exchange, you must hand over your pacer number to the next pacer.
  • Pacers are responsible for their own transport.
  • There are no Pacers for Kosci27, Kosci50 or Kosci100 runners.
  • Pacers may not carry extra water, food or equipment for runners.
  • With the exception of an emergency or medical situation, Pacers cannot provide any material or physical assistance to their athletes.


You may pick up a pacer from Sponars Chalet onwards. The pacer may run with you for as long as they wish until the end of the race.

Pacers can switch over at any checkpointed as designated below:

Checkpoint Location Distance from start Pacer Meeting/Change Over Point
CP7 Sponars Chalet 88.1km Yes
CP8 Sawpit Creek 97.7km Yes
CP9 Trout Hatchery 102km No
CP10 Banjo Paterson Park 114.7km Yes
CP11 Trout Hatchery 127.2km No
CP12 Bullocks Flat 146.6km Yes
CP13 Ngarigo Campground 154.9km Yes